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近年来,粉末冶金已成为一种可制造形状结构复杂、精度高及具有优异力学性能的零件的重要且成本可行的生产工艺。在铁基粉末冶金产品中,除碳外,Cu是应用最广的一种合金化元素。虽然Cu在锻轧钢中具有不良作用,但在粉末冶金钢中却具有显著强化作用。然而,Cu在烧结中会引起胀大,并且在与Fe粉的混合粉中倾向于偏聚,从而导致压坯的各部分组成之间发生变化,致使烧结件的尺寸显著分散。通过不同的方法将Cu粉粘结于Fe粉颗粒上,可有效地防止这种偏聚。本文评定了用不同的含Cu合金化系统得到的零件力学性能与尺寸变化。
In recent years, powder metallurgy has become an important and cost-effective production process for producing parts with complicated shape, high precision and excellent mechanical properties. In iron-based powder metallurgy products, in addition to carbon, Cu is the most widely used of alloying elements. Although Cu has an adverse effect on wrought steel, it has a significant strengthening effect in powder metallurgy steels. However, Cu expands during sintering and tends to segregate in the mixed powder with Fe powder, resulting in a change in the composition of the individual parts of the compact, resulting in a significant dispersion of the size of the sintered compact. Cu powder is bonded to the Fe powder particles by different methods, which can effectively prevent such segregation. In this paper, the mechanical properties and dimensional changes of parts obtained by different Cu-containing alloying systems are evaluated.